On 7/21/2025 3:26 AM, Barry Leiba wrote:
The number of message recipients is
unrelated to the number of RCPT commands for the purpose of this
discussion, and the fact that messages often have many recipients does
not mean that MSAs and/or MTAs need to use multiple RCPT commands in
one SMTP transaction.
The earlier, extended discussion about this had various postings about
average number of recipients listed in the RCPT-To command of an SMTP
session. The average number was barely larger than 1.0.
That is, the /observabl/e number of recipient addresses in nearly all
SMTP sessions was essentially 1.
The discussion was not theoretical, nor was it about the total number of
recipients of the message, but about the number listed in an individual
SMTP session.
I noted that this assessment seemed to be universal among all of the wg
participants reporting statistics for this.
As wg rough consensus goes, that's quite solid.
So from this, I took the view that there is no /practical/ need to worry
about a DKIM-related mechanism supporting signatures for multiple
addressees in the same copy.
d/
--
Dave Crocker
Brandenburg InternetWorking
bbiw.net
bluesky: @dcrocker.bsky.social
mast: @[email protected]
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